What are ANSI B16.5 Flanges

The ANSI B16.5 flanges are a unique standard of flanges and flange classes that have characteristics that give them varied utility. We all know that flanges have critical importance in waterworks and gas pipelines, but ANSI-regulated flanges have a more varied set of uses.

The American National Standards Institute was formally set up in 1918 and has helped to regulate the standards of performance for American products, services, and personnel. The ANSI B16.5 standard refers to flange standards determined by the ANSI, specifically pertaining to flanges that are made from forged steel.

ANSI B16.5 set of standards covers a larger variety of flange types. These are:

  • Slip-on flanges
  • Blind flanges
  • Weld neck flanges
  • Lap joint flanges
  • Threaded flanges
  • Socket weld flanges

Collectively, the ANSI B16.5 set of flanges provides numerous utilities across the industry.

What are ANSI B16.5 Flange Classes?

The ANSI B16.5 set of flange classes is differentiated on the basis of several factors. Some of the crucial ones include:

  • Temperature rating
  • Pressure rating
  • Dimensions
  • Materials

Based on these criteria, the B16.5 range is broadly classified into the following classes: 150, 300, 400, 600, 900, 1500 and 2500. As evident, the terminology of the classes indicates the pressure rating itself.

What is the Pressure Rating for ANSI B16.5

Flange pressure ratings are important as production and fabrication units must have an idea of the pressure that the equipment can withstand. Depending on the product itself, pressure ratings may go as high as 2500 psi. The ANSI B16.5 range has a much higher tolerance limit.

The pressure rating for the ANSI B16.5 range of flange sets and flange fittings begins from Class150 psi, which is the lowest pressure class, and exponentially increases to the Class 2500, which can withstand pressures of over 2500 psi.

If you wish to get the best ANSI B16.5-rated flange sets and fittings, choose Sumitec Int’l for high-quality products and services. They have been serving customers faithfully for years and have specialized experience in this standard set.

ANSI B16.5 Flanges Common Asked Questions

What weight flange is ANSI B16.5

The weight of the ANSI B16.5 flange range varies according to the class and flange type. Blind flanges typically weigh a lot more as they lack a bore dimension. Thus, the largest size, 24” Class 150 blind flange weighs 450 lbs, while the 24” Class 150 slip-on Class 150 weighs 204 lbs. At the other end of the spectrum, the largest size 12” Class 2500 blind flange weighs approximately 1464 lbs, while the 12” 2500 slip-on weighs 1608 lbs.

How do I select the right ANSI B16.5 flange for my application?

Selecting the right flange involves considering factors such as pipe size, wall thickness, pressure rating, material compatibility, and the specific requirements of your piping system. Consulting the ANSI B16.5 standard and working with knowledgeable engineers or suppliers can help you make the correct choice.

What types of flanges are covered by ANSI B16.5?

ANSI B16.5 covers a wide range of flange types, including weld neck, slip-on, threaded, alp joint, socket weld, and blind flanges. It also provides specifications for orifice flanges and long weld neck flanges.

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